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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