SLCTR Registration Number
Date of Registration
The date of last modification
Jun 25, 2018
Scientific Title of Trial
A Randomized Control Trial comparing vitamin D supplementation versus placebo on glycemic control in gestational diabetes mellitus
Public Title of Trial
A randomized controlled clinical trial to compare the efficacy of Vitamin D vs placebo to reduce high blood sugar during pregnancy
Disease of Health Condition(s) Studied
Universal Trial Number
Any other number(s) assigned to the trial and issuing authority
(Ref. No. P/277/12/2017: ERC Kelaniya)
What is the research question being addressed?
Is there an effect of Vitamin D on improving glycemic control in gestational diabetes?
Type of study
Randomized controlled trial
Study site is the antenatal clinic of the Colombo North Teaching Hospital, Ragama.
Block randomization will be done using a computer generated sequence using a web based application. Block size has been taken as 6. The generated sequence will be concealed with sealed envelope method. Recruitment of participants and the allocation will be done by two different medical officers leading to allocation concealment.
Alfacalcidol 0.25 microgram capsule will be given to the intervention arm once a day orally as Vitamin D supplementation for a period of 4 weeks.
Folic acid 1 mg tablet will be given once a day orally for the control arm as placebo for a period of 4 weeks.
In addition, folic acid 1 mg tablet once day orally will be given to both groups as it is the standard antenatal practice of Sri Lanka (The control arm will receive this folic acid treatment on top of the placebo treatment).
During the trial period blood sugar will be routinely monitored and fetal monitoring will be carried out. If a participant needs to be started on insulin according to blood sugar measurements, they will be dropped from the trial and insulin treatment will be initiated.
Outcomes will be measured only in participants who still remain within inclusion criteria after completion of the trial.
If patients are removed due to adverse effects of Vitamin D it will be specifically reported in the conclusion and will also be reported to the National Medicines Regulatory Authority.
The mean difference of blood glucose levels in the two arms before and after the intervention.
Blood glucose levels will be measured by fasting blood sugar (FBS) test and 1hour post prandial blood sugar (PPBS) (post breakfast) test
Primary outcome(s) - Time of assessment(s)
Day1 (before the intervention) and after 4 weeks of intervention.
Any difference of occurrence of the following
10. Gestational hypertension during the pregnancy
11. Caesarian section rate
12. Instrumental delivery rates
Secondary outcome(s) - Time of assessment(s)
Adverse effects to Vitamin D in participant will be monitored during the trial period and until the delivery.
Occurrence of mentioned adverse drug effects in neonate will be observed within the first 24 hours of the delivery.
Target number/sample size
48 (24 in each arm)
Countries of recruitment
Anticipated start date
Anticipated end date
State of ethics review approval
Received (Ref. No. P/277/12/2017: ERC Kelaniya)
None (Investigator funded)
Contact person for Scientific Queries/Principal Investigator
Dr. Tharaka Sandaruwan
Colombo North Teaching Hospital, Ragama
Contact Person for Public Queries
Dr. Carmeline Motha
Ward 24/25 Colombo North Teaching Hospital, Ragama
Primary study sponsor/organization
Colombo North Teaching Hospital
Hospital Inner Road, Ragama 11010
Tel: 0112960023 0112960523