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Table 2 Blood spot TSH level (mIU/L) distribution according to the date of blood spot collection

From: Indicators of newborn screening for congenital hypothyroidism in Sri Lanka: program challenges and way forward

   Sample collected on
   < 12 hrs Day 1 Day 2 Day 3 After Day 4
   (n = 4472) (n = 44969) (n = 14516) (n = 6315) (n = 7090)
Normal infants n 4359 44640 14487 6300 7037
Median 7.3 6.2 2.8 1.8 2.1
(n = 76823) Range 1.0 – 39.9 1.00 – 39.9 1.00 – 39.7 1.00 – 18.2 1.00 – 19.3
False positives n 112 301 23 15 41
Median 47.3 47.2 61.9 53.4 53.4
(n = 492) Range 40.0 – 268.7 40.0 – 319.4 40.2 – 312.5 24.7 – 121.5 20.1 – 258.4
True positives n 1 28 6 -- 12
Median 230.10 191.4 204.7 -- 189.3
(n = 47) Range   48.4 – 342.1 81.0 – 370.9 -- 32.4 – 409.6