Insulin-like Growth Factor 1 (IGF-1)

Specimen Container

Gel separator tube (Adult)
Microtube (Paeds)

Specimen Requirement

Plain Blood
Adult: 5 mL
Paediatric: 1.3 mL

Invert blood 5 times after blood collection ensures the anticoagulant is well mixed with the blood. This will ensure results are reliable.

Specimen Storage / Transport

Instruction for external hospitals/laboratories:
Serum should be separated from blood cells immediately.
IGF-1 is stable for up to 24 hours at 2 to 8 degrees Celsius, or for 12 months at -20 degrees Celsius.

Method

Orderable as STAT?

No

Turn Around Time

1 - 4 days

Reference Value(s)

Age Group (years)	Gender	Reference Intervals (ug/L)
0 - 3	Male	< 15 - 129
4 - 6	Male	22 - 208
7 - 9	Male	40 - 255
10 - 11	Male	69 - 316
12 - 13	Male	143 - 506
14 - 15	Male	177 - 507
16 - 18	Male	173 - 414
0 - 3	Female	18 - 172
4 - 6	Female	35 - 232
7 - 9	Female	57 - 277
10 - 11	Female	118 - 448
12 - 13	Female	170 - 527
14 - 15	Female	191 - 496
16 - 18	Female	190 - 429


Age Group (years)	Gender	Reference Intervals (ug/L)
19 - 21	Both	117 - 323
22 - 24	Both	99 - 289
25 - 29	Both	84 - 259
30 - 34	Both	71 - 234
35 - 39	Both	63 - 223
40 - 44	Both	58 - 219
45 -49	Both	53 - 215
50 - 54	Both	48 - 209
55 - 59	Both	45 - 210
60 - 64	Both	43 - 220
65 -69	Both	40 - 225
70 - 79	Both	35 - 216
80 - 90	Both	31 - 208


Tanner stage-specific IGF-1 reference intervals

Tanner Stage	Gender	Reference Intervals (ug/L)
1	Female	71 - 394
2	Female	122 - 508
3	Female	164 - 545
4	Female	174 - 480
5	Female	169 - 400
1	Male	63 - 271
2	Male	114 - 411
3	Male	166 - 510
4	Male	170 - 456
5	Male	161 - 384

Testing Laboratory Location

KKH

Laboratory

Clinical Chemistry

Contact Number

6394 1383

Day and Time Performed

Monday and Thursday

Orderable on CPOE?

No

Downtime Form

Clinical Chemistry - Form B

Additional Information

Immunoassay measurements can be subject to interference from cross-reacting substances in the patient's blood. If the result does not agree with the clinical picture, please contact the laboratory for further action.