Insulin-like Growth Factor 1 (IGF-1)

XU0111

Synonym(s):
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 clot-activating factors 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.
Orderable as Urgent? No
Turn Around Time
1 - 4 days
Reference Value(s)
Age Group (years)GenderReference Intervals (ug/L)
0 - 3Male< 15 - 129
4 - 6Male22 - 208
7 - 9Male40 - 255
10 - 11Male69 - 316
12 - 13Male143 - 506
14 - 15Male177 - 507
16 - 18Male173 - 414
0 - 3Female18 - 172
4 - 6Female35 - 232
7 - 9Female57 - 277
10 - 11Female118 - 448
12 - 13Female170 - 527
14 - 15Female191 - 496
16 - 18Female190 - 429
Age Group (years)GenderReference Intervals (ug/L)
19 - 21Both117 - 323
22 - 24Both99 - 289
25 - 29Both84 - 259
30 - 34Both71 - 234
35 - 39Both63 - 223
40 - 44Both58 - 219
45 -49Both53 - 215
50 - 54Both48 - 209
55 - 59Both45 - 210
60 - 64Both43 - 220
65 -69Both40 - 225
70 - 79Both35 - 216
80 - 90Both31 - 208
Tanner stage-specific IGF-1 reference intervals
Tanner StageGenderReference Intervals (ug/L)
1Female71 - 394
2Female122 - 508
3Female164 - 545
4Female174 - 480
5Female169 - 400
1Male63 - 271
2Male114 - 411
3Male166 - 510
4Male170 - 456
5Male161 - 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 A

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.​

Change History Notes

  • 27 May 2024 08:00 AM

    Update of Specimen Requirement.

  • 11 Oct 2021 02:55 PM

    ​Updated specimen requirement.

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Last Updated - 27 May 2025