J.Sirisena, L Jayasena D Nanayakkara;"A Study of Major birth defects seen at a General hospital”.  Kandy Med J.1993; 2(2) 58-61

Jayantha Sirisena, Damayanthi Nanayakkara L.Jayasena;"Birth defects in 2040 consecutive deliveries of General Hospital Peradeniya" Proceedings of the 26th Annual Scientific Sessions, Sri Lanka College of Obstetricians & Gynaecologists. 9-13 July 1993 (Abstract -P15) 

Nanayakkara DKK; "Renal Artery stenosis - Review" (Oral presentation)
Clinical meeting, Medical physics, Royal Victoria Infirmary, Newcastle upon Tyne, UK, 5.October 1999.

Nanayakkara DKK; "Evaluation of the validity of pre operative localisation of parathyroid glands using I123 /Tl201 " (Oral Presentation)
 Clinical meeting, Medical physics, Royal Victoria Infirmary, Newcastle upon Tyne, UK 6 December 1999.

Dissanayake A, Nanayakkara D, Siribaddana SH, Hewage UCL, Fernando DJS."Transient hypothyroidism after treatment with 131I in Sri Lankan patients with Graves' disease"
Proceedings of the 3rd meeting of the British Thyroid Association, Royal College of Physicians - London (P10 Poster - 10 Nov. 1999)

Nanayakkara DKK "RAI in thyroid disease" Endocrine unit academic meetings - 2000; The Medical School, University of Newcastle, UK (Oral presentation - 6 Feb 2000)

Nanayakkara DKK, Keir MJ, Robinson A, Ball SG (2000)"The effect of pre treatment with anti thyroid drugs (ATD) on the out come of both fixed dose and calculated dose RAI therapy for Graves' disease; A retrospective Analysis": Journal of Endocrinology (Abstract Supplement), 164, P 339, Birmingham , UK

DKK Nanayakkara, MJ Keir, SG Ball (2000); Radioiodine therapy- Audit of fixed dose outcome for Graves' disease and toxic multinodular goitre, Nuclear Medicine Communications, 21, P 402    Brighton ,UK

DKK Nanayakkara "A comparison of fixed dose versus graded dose of radioiodine for the treatment of thyrotoxicosis and the effects of pre-treatment with antithyroid drugs on the outcome of treatment"     
Thesis submitted for the degree of M.Phil. at the University of Newcastle, UK  (July 2000)

DKK Nanayakkara, MN Jiffry, WKK Perera, Routine Assessment of thyroid function test (TFT) in menorrhagia (oral presentation); Proceedings of the 34th Annual Scientific Sessions, Sri Lanka College of Obstetricians & Gynaecologists. 10-12 August 2001 (Abstract -P15) 

DKK Nanayakkara, MN Jiffry, GAB Weersekara, Prevalence of premature Ovarian Failure. (Oral presentation); Proceedings of the 34th Annual Scientific Sessions, Sri Lanka College of Obstetricians & Gynaecologists. 10-12 August 2001 (Abstract -P15) 

DKK Nanayakkara, MN Jiffry, GAB Weersekara, Hormone assessment in patients with polycystic ovaries and menstrual problems; Proceedings of the 24th Annual academic sessions, of the Kandy society of Medicine, Vol. 24 Feb 2002 (Abstract -P45)

DKK Nanayakkara, ASB Wijekoon, DM Hemawardana, GAB Weerasekara, AA Tammita, ASDI Silva, WKK Perera; Retrospective analysis of clinical symptoms used for detection of congenital hypothyroidism; Proceedings of the Peradeniya university Research sessions, Vol 8 Nov 30, 2002 p100
(This paper was adjudged a commendable presentation at the session)

DKK Nanayakkara, ASB Wijekoon. Hypothalamic-pituitary hypothyroidism detected by biochemical screening for congenital hypothyroidism; Proceeding of The Kandy Society of Medicine Jubilee academic sessions, Vol. 25, 5-7 February 2003 (abstract 94p)

DKK Nanayakkara, ASB Wijekoon. Laboratory screening for congenital hypothyroidism in early infancy, a hospital-based study: Proceedings of the Peradeniya University Research Sessions Vol.9, Nov 10, 2004; p103

D.Nanayakkara, C.Udugama, L.Watawana, D.M.Hemawardana et.al Radioiodine application in the management of differentiated thyroid cancer (DTC)-A descriptive study; Proceedings of the Annual academic sessions of the Kandy society of Medicine 27 Feb 2005 (P85-86)

D.Nanayakkara, Radioiodine application (I131) in the management of differentiated thyroid cancer (DTC)-Audit.  International Conference on Radio pharmaceutical Therapy organised by World Radio pharmaceutical Therapy Council (World Federation of Nuclear Medicine & Biology) Limassol, Cyprus 11-14 Oct 2005 oral presentation, World Journal of Nuclear Medicine, Vol.4, supplement1, Oct 2005 pages 54-55.

D.Nanayakkara, A.Wijekoon, KK Solanki, The Role of Thyroid scans in early infancy. EANM’05- Annual Congress of the European Association of Nuclear Medicine, Istanbul, Turkey 15-19 Oct 2005  (poster presentation P513 Paediatrics) Eur.J of Nuclear Medicine & Mol. Imaging 2005 Vol.32 sept. S222

D.Nanayakkara, A.Wijekoon A report on the follow up of infants with   marginal hyperthyrotropinemia in early Infancy Proceedings of Peradeniya University Research Sessions, Sri Lanka, Vol.10, Nov 10, 2005

Balasuriya BM, Nanayakara D, Goonasekara CD (2005) Brain death confirmed by Tc(99m) DTPA scan in a case of subarachnoid haemorrhage following a krait bite. Ceylon Med J 50: 165–166. doi: 10.4038/cmj.v50i4.1409

A.S.B. Wijekoon, D.K.K.Nanayakkara, Nawaz Jiffry, M.Rasnayake, Jiffry Nilam, G.Liyanage, Solanki, K., “Towards Neonatal screening for congenital hypothyroidism in Sri Lanka”. A pilot project; Abstracts, ISNS Proceedings of the 6th meeting of the International Society for Neonatal Screening; Sept 16-19 2006 Japan (WS 49) p 108

D.Nanayakkara, K.Perera, S.Herath, N.Jiffry, J.Nilam, K.Solanki: Neonatal screening for congenital hypothyroidism; First Experience. Proceedings of the Peradeniya University Research Sessions, Sri Lanka, Vol.11, Nov 30, 2006; p110

Damayanthi Nanayakkara, Nawaz Jiffry, Nilam Jiffry, Liyanage, Guwani Liyanage, Kishor Solanki, and Rasnayake Muduyanse (2007). Neonatal screening for congenital hypothyroidism – pilot project experience in Sri Lanka. Proceedings of the 12th Asia Pacific Congress of Paediatrics and 2nd Asia Pacific Congress of Paediatrics Nursing in Conjunction with 10th Annual Congress of Sri Lanka College of Paediatricians Vol 1, Issue 1 12-15th  March 2007 Sri Lanka.

Damayanthi Nanayakkara “Is administered Radioiodine activity appropriate? The effects of pre treatment antithyroid drugs on the therapy outcome” ICRT 2007, World Journal of Nuclear Medicine, 6 (1) pages 43-44. 3-7 Sept 2007 in Ulaanbaatar, Mongolia
 (This paper was adjudged an excellent presentation at the session)

D.Nanayakkara, A. Wijekoon, N, Jiffry, R.Mudiyanse, J, Nilam, K.Perera, S.Herath, K. Solanki, Screening for Congenital Hypothyroidism in Government Hospitals in Sri Lanka. Proceedings of Peradeniya University Research Sessions, Sri Lanka, Vol.12, part 1 Nov 30, 2007

DKK Nanayakkara “The practice and limitations of screening for congenital hypothyroidism in selected hospitals in SriLanka”
Thesis submitted for the degree of PhD at the University of Peradeniya, Sri Lanka (April 2007)

Nanayakkara D., Udugama C., Perera K., Herath S., Manodara R., Wjethungaarchci I: Management of Differentiated thyroid carcinoma with available facilities for radioiodine therapy.  ISRT 2008, World Journal of Nuclear Medicine, vol 7 (4) Oct 2008 pages 243-244. 27-30 Goa, India

Chandana N.G.A.S.S., Nanayakkara D.K.K., Rosario S., Pethiyagoda A.U.B.:    Hormonal Assessment of subfertile men with idiopathic non-obstructive Azoospermia or Oligospermia: Proceedings of Peradeniya University Research Sessions, Sri Lanka, Vol.13, (18th Dec, 2008) P 235

Abeysekara R.A., Bandara U.N., Nayakarathna R.K., Megodagoda N.T., Shiroma R.G.L., Abeykoon H.P., Nanayakkara D.K.K, Udugama C., Watawana L, Rajarathna A.A.J.: Ventilatory Functions of Hypothyroid, Hyperthyroid and Euthyroid individuals: Proceedings of Peradeniya University Research Sessions, Sri Lanka, Vol.13, (18th Dec, 2008) P 261

Nanayakkara D.K.K. “Pilot study on low dose radioiodine ablation of thyroid remnants” Proceedings of Peradeniya University Research Sessions, Sri Lanka, Vol.14, (3rd  Dec, 2009) P 148

Nanayakkara D.K.K. “Assessment of thyroid functions using serum TSH measurement in a group of adult females; a prospective study” Proceedings of Peradeniya University Research Sessions, Sri Lanka, Vol.14, (2009) P 160

Chandana N.G.A.S.S., Nanayakkara D.K.K., Rosario S., Pethiyagoda A.U.B, Bandara H.G.W.A.P.L., Bandara Y.M.S.P.Y. “ Relationship of Hormone Concentrations to Testicular Volume in  Non-obstructive Azoospermia or Oligospermia”, Proceedings of Medical Technology , Window on Science and Technology, special seminar issue, Vol XX-2010, All India Institute of Medical Technologists, Kolkata, India

Pethiyagoda, A.U.B., Rosairo, S, Bandara, H.G.W.A.P.L., Bandara, Y.M.S.P.Y, Chandana,  N.G.A.S.S., Nanayakkara, D.(2010),”Relationship of Hormone Concentrations to Testicular Volume in Non Obstructive Azoospermia and Oligospermia,” 32nd The Kandy Society of Medicine, p41-42

Pethiyagoda A.U.B., Rosairo S, Nanayakkara D.K.K., Weragoda W.A.R.V., Bandara H.G.W.A.P.L.,  Pathirana L.Y.V., Bandara Y.M.S.P.Y., “Pattern of hormonal and sonographical testicular abnormalities in subfertile males with azoospermia”. 33rd The Kandy Society of Medicine - 2011, p82.

Pethiyagoda A.U.B., Nanayakkara D.K.K., Udugama C., Watawana L., Weragoda W.A.R.V., Pathirana L.Y.V., Bandara H.G.W.A.P.A., “Characteristics of TC 99M renal DTPA studies in the evaluation of upper urinary tract abnormalities carried out at Teaching Hospital Peradeniya”. 33rd The Kandy Society of Medicine- 2011, p120

Manjula Hettiarchchi & Damayanthi Nanayakkara “Current status of newborn screening in Sri Lanka”  3rd meeting on Consolidating Newborn screening efforts in the Asia Pasific Regeion; 25-27 February, Manila, Philippines (oral presentation)

Pethiyagoda A.U.B, Priyadharshani R.M.S, Bandara H.G.W.A.P.L., Nanayakkara D.K.K, Udugama C, Watawana L, Weragoda, W.A.R.V, Pathirana L.Y.V. “ Assessment of upper Urinary Tract Abnormalities using technetium 99m Renal DTPA Studies in paediatrics Population” 34th The Kandy Society of Medicine- 2012, p 85

H.G.W.A.P.L.Bandara Pethiyagoda A.U.B, Priyadharshani R.M.S , Nanayakkara D.K.K, Udugama C, Watawana L, “The pattern of distribution of bone metastases in prostate carcinoma;Technetium99mMDP(Methylene Diphosphonate bone isotope study” 34th The Kandy Society of Medicine- 2012, p 87

Nanayakkara,D.K.K,  Hearth S.S, Galliyadda A  “Low Dose Radioiodine Ablation for Differentiated Thyroid Carcinoma (DTC) - A Retrospective Analysis” (Poster Presentation) 7th International conference on radiopharmaceutical therapy (ICRT 2012)  25-29 Nov 2012 , Levi, Finland  
World Journal of Nuclear Medicine, vol 11 (3) Sept 2012 pages 169-170

S.Nanadakumara, D.Nanayakkara ,S.S.Herath,R. Sivakanesan. “Thyroid dysfunction among subfertile women – a retrospective study” Proceedings of Peradeniya University Research Sessions, Sri Lanka, Vol.17, (4th July, 2013) P 120

Kavithanjaly Rajeevan, R.Sivakanesan , D.Nanayakkara “A    study on total antioxidant capacity and Oxidative stress in hypothyroid patients” Proceedings of Peradeniya University Research Sessions, Sri Lanka, Vol.17, (4th July, 2013) P 119

R.K.De Mel,M.R.D.Kumara, A.Dangolla, J,Jayasekara, D.K.K.Nanayakara, C.Rajapakse, W.D.Rathnasooriya, D.K.Weerakoon “An assessment of the stress levels of captive elephants held under different management conditions using serum cortisol levels;  Proceedings of Peradeniya University Research Sessions, Sri Lanka, Vol.17, (4th July, 2013) P 120

Shigeru Kosuda,Faridul Alam, Zhiming Yao, Kardinah Kardinah, Boon-Nang Lee,  Byambajav Enkhthuya,Hla Soe, Raza Hasan, Jonas Francisco Santiago, Chang Woon Choi, David Ng Chee Eng, S. Somanesan, Damayanthi Kusum Kumari Nanayakkara, Molrudee Ekmahachai, Nonglak Vilasdechanon, Anchali Krisanachinda, huan Tran Van,Sze Ting Lee, Tomio Inoue, Venkatesh Rangarajan, Maurizio Dondi “Report on the Current Nuclear Medicine Status
of the Asian Member States from the Initial Cooperative Project Meeting  (RAS6061/9001/01) of International Atomic Energy Agency/Regional Cooperative Agreement (IAEA/RCA); Austral-Asian Journal of Cancer, Vol 12 (3) July 2013, p 135-145(ISSN-0972 -2556).

A. M. S. M. Wickramarathne, R. Sivakanesan D. K. K. Nanayakkara ; “Relationship between thyroid stimulating hormone and antioxidant status in patients with suspected thyroid dysfunction” Proceedings of Peradeniya University Research Sessions, Sri Lanka, Vol.18, (4th -5th July, 2014) P 311 (Poster Presentation)

A. M. S. M. Wickramarathne, R. Sivakanesan D. K. K. Nanayakkara; “Urinary iodine excretion and serum thyroid stimulating hormone in patients with suspected thyroid dysfunction” Proceedings of Peradeniya University Research Sessions, Sri Lanka, Vol.18, (4th -5th July, 2014) P 312 (Poster Presentation)

K. A. D. N. S. Jayarathna , S.I.Nawaz, D. K. K. Nanayakkara , S. S. Herath ; “Role of DMSA scan in the management of urinary tract infection in children” ; Proceedings of Peradeniya University Research Sessions, Sri Lanka, Vol.18, (4th -5th July, 2014) P 235 (Poster Presentation)

S. Nandakumara, R. Sivakanesan, D. Nanayakkara, S. S. Hearth; “Total antioxidant capacity, free protein Thiols and Arylesterase activity in subfertile women” ;Proceedings of Peradeniya University Research Sessions, Sri Lanka, Vol.18, (4th -5th July, 2014) P 334( Oral Presentation)

A. M. S. M. Wickramarathne1,2*, R. Sivakanesan2, D. K. K. Nanayakkara; “Serum Thiobarbituric acid reactive substances and protein thiol concentration in euthyroid patients investigated for thyroid dysfunction”. Proceedings of PGIS research congress 10-11 Oct 2014, p 77

Sivakanesan R, Wickramarathna AMSM, Nanayakkara DKK .(2014); “Serum Thyroid stimulating Hormone and antioxidant status in patients with suspected thyroid dysfunction”.MOJ Clin Med Case Rep (1)0004.DOI:10.15406/Mojcr.2014.01.00004

Dehigolle V.P, Nanayakkara D.K.K, Herath S, Jiffry M.N (2015); “Thyroid status and the quality of the seminal fluid”, Abstracts supplement of 37th Annual academic sessions of the Kandy Society of Medicine- 11-14 Feb 2015. (oral presentation, FP7/OP4), p 41

D. K. K. Nanayakkara, S.I.Nawaz : Could normal renal ultrasonography   replace the necessity of DMSA renal cortical scan in the management urinary tract infection in children?  Asia Oceania Journal of Nuclear Medicine & Biology (2015); vol 3, supplement 1 page.568 (abstract)

Premasiri DGKMM,Nanayakkara DKK, Nawaz SI; Radioiodine thyroid remnant Ablation – A 10 year Experience Abstracts supplement of 38th Annual academic sessions of the Kandy Society of Medicine- 11-13 Feb 2016. (oral presentation, S140 /OP65), p 108

Jiffry   MN and Nanayakkara DKK; Factors Influencing the Decision Making on Prescribing by Doctors,Abstracts supplement of 38th Annual academic sessions of the Kandy Society of Medicine- 11-13 Feb 2016. (Poster presentation,S2P48), p 162

Nanayakkara,DKK; Lenadora,SD; Kodikaracarachchi,TI;Maddumabandara,HR; Kottahachchy,KIM;Lesheni,MAD; Kumara,GRMK;Kumara ,RGCS; Liyanage,LNP; Madanayake,BMC; Lakshitha,JS; Tshnering,L;  Knowledge and awareness regarding Clinic attendance and complications related to disease among thyroid patients. Proceedings of Peradeniya University Research Sessions, Sri Lanka, Vol.21, (24th Nov, 2017) P 217 (Poster Presentation)

Nanayakkara DKK, Wijesooriya DPNP; Nawaz SI, Low Bone Mass in Postmenopausal Women – A cross sectional Study  Abstracts supplement of  40th Annual academic sessions of the Kandy Society of Medicine- 15-17th Feb 2018. (Oral presentation, OP 10), p 21

D.K.K. Nanayakkara, S.D Lenadora,T.I Kodikara Arachchi, H.R..Maddumabandara, K.I.M.Kottahachchy, M.A.D.Lesheni, GRMK Kumara, RGCS Kumara , LNPLiyanage, BMC Madanayake, J.S.Lakshitha, L Tshnering  ; Awareness and Knowledge on medication among patients with thyroid diseases attending a local clinic  . Abstracts supplement of  40th Annual academic sessions of the Kandy Society of Medicine- 15-17th Feb 2018. (Posterl presentation, PP 02), p 49

Nanayakkara DKK, Nawaz SI,, Samarakoon G, Jayasooriya N A; Low dose Thyroid remnant ablation – A follow up study; WFNMB 2018 - 12th Congress of the World Federation of Nuclear Medicine and Biology, Melbourne , Australia 19-24th April 2018 (Poster) WFNMB 18 –ABS 1876[Downloaded free from http://www.wjnm.org on Monday, November 26, 2018, IP: 10.40.158.194)
World Journal of Nuclear Medicine/Volume 17/Supplement 1/September 2018

Nanayakkara DKK , Nawaz SI ; Rare presentation of a thyroid cancer patient with   Radioiodine uptake in Aspergilloma WFNMB 2018 - 12th Congress of the World Federation of Nuclear Medicine and Biology Melbourne , Australia 19-24th April 2018
World Journal of Nuclear Medicine/Volume 17/Supplement 1/September 2018

Nanayakkara DKK, Kothwela VK, Rathnayake NMMS, Detection of Congenital renal Anomalies in children using DMSA renal scan;Abstracts supplement of 41st  Annual academic sessions of the Kandy Society of Medicine- 14-15 Feb 2019. (Oral presentation, OP14 P 30

Nanayakkara DKK, Kothwela VK, Rathnayake NMMS, Identifying the risk factors for low bone mineral density and osteoporosis risk in post-menopausal women; Abstracts supplement of 41st  Annual academic sessions of the Kandy Society of Medicine- 14-15 Feb 2019. (Oral presentation, OP14 P 50

M.F. Shirooza, D.K.K. Nanayakkara, J.A.C.P. Jayalath and V. Sivakumar ; DOSIMETRY ON 131I TREATMENT AT THE NUCLEAR MEDICINE UNIT OF UNIVERSITY OF PERADENIYA :11th October, 2019  PGIS Research Congress 2019; ID 113 oral presentation, p

D.S. Weerasekera, A.N.L. Rathnasekara, H.M.S.S. Herath , D.K.K. Nanayakkara, S.J. Perera and K.B. Ranawana ; TESTOSTERONE LEVELS IN RELATION TO ANTLER GROWTH IN MALE SAMBAR DEER (RUSA UNICOLOR UNICOLOR) IN HORTON PLAINS NATIONAL PARK, SRI LANKA (poster presentation ID 26) 11th October, 2019 : PGIS Research Congress 2019; p

Nanayakkara D.K.K.,Sanooz Raheem, Kothwela V.K.Rathnayaka NMMS: Evaluating the risk of low bone mineral density(BMD) among the post menopausal breast cancer survivors compared with post-menopausal non breast cancer women: A single center experience, Abstracts supplement of 42ndt  Annual academic sessions of the Kandy Society of Medicine- 5-7 Feb 2020. (Oral presentation, OPA6 P 18

Nanayakkara D.K.K, Kamalanathan H,kandegedara SN, Kankanamge DS, Karunarathna LNM, Karunarathna WGDU, Karunarathna SHPYC, Kavisekara KMTTB, Kodithuwakku MKGC, Kulathunga LHPK, Kowshikanth K, Kariyawasam PRC, Co-Morbidities among female patients with thyroid dysfunctions Abstracts supplement of 42nd  Annual academic sessions of the Kandy Society of Medicine- 5-7th Feb 2020. (Poster presentation, D1PPB10. P 60

D.S.Weerasekara, S.J.Perera, D.K.K.Nanayakkara, H.M.S.S.Herath , A.N.L.Rathnasekara and K.B.Ranawana;  The Antler cycle and faecal Testosterone of male Sambar deer Rusa unicolor at the Horton Plains National Park in Sri Lanka; Hindawi Biomed Research International Volume 2020, 7 pages;   Research Article | Open Access ;http://doi.org/10.1155/2020/6903407

Sanooz Raheem, Nanayakkara D.K.K:; “Correlation between the Free T4 level at disease presentation and the Free T4 level after the fixed dose Radioiodine therapy among the hyperthyroid patients”; Sri Lanka College of Endocrinologists annual scientific session SLENDO HYBRID 2020 e book PP2 (p 13) 6-8 Aug 2020

Raheem, S. and Nanayakkara, D.K.K., 2020. Correlation of free T4 level at diagnosis and 03, 06 months after fixed dose radioiodine therapy among the hyperthyroid patients. (Original Article); Sri Lanka Journal of Diabetes Endocrinology and Metabolism,(SJDEM) 10(2), pp.28–36. DOI: http://doi.org/10.4038/sjdem.v10i2.7407

Sanooz, Raheem; Nanayakkara, D.K.K; Effect of pre-treatment with carbimazole on the outcome of Radioactive Iodine 131therapy for patients with hyperthyroidism: Proceedings of the National conference on multidisciplinary research 2020, Young scientists association, National Institute of Fundamental Studies, Sri Lanka , October 8 2020, P 2 (ISSN 2756-9063)

Sanooz, Raheem; Nanayakkara, D.K.K; STARTING ANTITHYROID DRUGS IMMEDIATELY AFTER THE RADIOACTIVE IODINE THERAPY: EFFECT IN THE THERAPEUTIC OUTCOME AMONG THYROTOXIC PATIENTS: Proceedings of the Academic Sessions of the Sri Lanka Association of clinical Pharmacology and therapeutics (SLACPT) Academic session – 2020 on 28th Nov 2020 PP2 (p 28-29)

Damayanthi Nanayakkara; Sanooz Raheem; Saumya Nawaz ; Piumi Herath; “Presence of residual thyroid tissue after thyroidectomy in differentiated thyroid  cancer patients and the limitation of using Thyroglobulin level as a prognostic indicator for first Radioactive Iodine ablation therapy” 5-6 Dec  ICRT virtual congress PP (abstract No.99) World Journal of Nuclear Medicine / Volume 19 / Issue 4 / October-December 2020 p 467

Nawaz SI, Herath HMPN, Nanayakkara DKK, Jiffry MN: “A study to evaluate the association of bone mineral density (BMD) with selected gynaecological factors in Sri Lankan postmenopausal women” ; 53rd Annual Scientific Congress 2020, Sri Lanka College of Obstetricians and Gynaecologists, The Sri Lanka Journal of Obstetrics and Gynaecology(Supplement issue) 11-13 Dec 2020. FP001, P1-2

Nawaz SI, Herath HMPN, Nanayakkara DKK, Jiffry MN: “ The duration of menopause and the regional bone mineral density pattern in  postmenopausal women” ; 53rd Annual Scientific Congress 2020, Sri Lanka College of Obstetricians and Gynaecologists, The Sri Lanka Journal of Obstetrics and Gynaecology(Supplement issue) 11-13 Dec 2020. FP007, P7-8

Sanooz Raheem, Damayanthi Nanayakkara Effect of pre-treatment with carbimazole on the outcome of radioactive iodine-131 therapy for patients with hyperthyroidism (Original Article) CJMS 2020; 57 (1): 14-18;DOI: http://doi.org/10.4038/cjms.v57i1.4965 ; https://orcid.org/0000-0002-5042-6363

Sanooz Rahim, S.I.Nawaz,, HMPN Herath , Nanayakkara DKK; “Congenital kidney anomalies and associated other urinary tract abnormalities among children  referred for Tc99m DMSA scan at Nuclear Medicine Unit, Peradeniya”; 23rd Annual Scientific Congress, Proceedings of the Sri Lanka College of Paediartician: ISBN 1391-2992, Vol 5 (4), 30-31 Jan 2021.Colombo .p 105

Sanooz ARM, Nanayakkara DKK; Carbimazole and radioactive iodine therapy outcome among hyperthyroid patients: A prospective study;4th Annual Congress, Sri Lanka College of Internal Medicine (SIMCON2020 Kandy)24-26th Feb 2021,ISBN:978-624-5676-00-2   OP 08  p14

Sanooz ARM, Nanayakkara DKK; Difference in outcome of radioactive iodine therapy with the duration of discontinuation of carbimazole among hyperthyroid patients  ; Abstracts supplement of 43rd  Annual academic sessions of the Kandy Society of Medicine- 7-9th April 2021. (Oral presentation, OPF 4. P 101

S Weerasekera Danushka, IA Subotsina, HMSS Herath, NU Jayawardana, D.K.K. Nanayakkara, SJ Perera, KB Ranawana, NA Jayasooriya MONITORING OF REPRODUCTION AND INFLUENCE OF FECAL PROGESTERONE ON REPRODUCTIVE CYCLICITY IN CAPTIVE SRI LANKAN SAMBAR DEER (RUSA UNICOLOR UNICOLOR)  57 (1)p 136-140.DOI: 10.52368/2078-0109-2021-57-1-136-140

Sanooze Rahim, S.I.Nawaz,, HMPN Herath , Nanayakkara DKK; Does high body mass index protect against osteoporosis?  : Abstracts supplement of 43rd  Annual academic sessions of the Kandy Society of Medicine- 7-9th April 2021. (Oral presentation, OPF 5. P 102

Cole B.Hirschfeld; Leslee J.Shaw; Michelle C.Williams; RyanLahey ; Damayanthi Kusum Kumari Nanayakkara et.al;Impact of COVID-19 on Cardiovascular Testing in the United States Versus the Rest of the World: The INCAPS-COVID Study, JACC: Cardiovascular Imaging ;Available online 16 June 2021 https://doi.org/10.1016/j.jcmg.2021.03.007

N.M.M.S.Rathnayake*, D.K.K.Nanayakkara, S.A.A.S.Bandara; “Comparison of the radiation   exposure to the staff before and after the QUANUM audit” ORAL PRESENTATION ABSTRACTS [S1-09] proceeding of the 20th Annual congress of Asian Regional Cooperative Council for Nuclear Medicine (ARCCNM) P 71-72

A.R.M. Sanooz, D.K.K. Nanayakkara, “Therapeutic Outcome of 10 mCi Radioactive Iodine for Graves’ Disease: A Prospective Follow Up Study” (Oral presentation); Proceedings of Peradeniya University International Research Sessions 2021(iPURSE) Sri Lanka, Vol.14, (11-12   Nov 2021) P 296

S Mubarak, D.K.K. Nanayakkara, C. Jayalath, V. Sivakumar; Low dose radioiodine therapy: A review of dosimetry and evaluation of potential shielding materials for neck collars (Research Article),J.Natn.Sci.Foundation.SriLanka;49(4),p583-591  ;DOI;http://dx.doi.org/10.4038/jnsfsr.v49i4.10080)

D.K.K Nanayakkara, A.R.MSanooz, S.I Nawaz, H.M.P.N Herath “Comparison between the mean age of diagnosing osteoporosis in patients on long-term glucocorticoids and not on glucocorticoids” (Oral presentation) Proceedings of Peradeniya University International Research Sessions  2021(iPURSE) Sri Lanka, Vol.14, ( Nov 2021) P 282

E.M.D.K.B. Hathnagoda, V. Sivakumar, D.K.K. Nanayakkara and N.M.M.S. Rathnayake; “Construction of low cost, non-toxic radiation shielding material for radiation protection” Proceedings of International Conference Multidisciplinary Approaches in Science 24th-26th November 2021) Tract C  , p 98