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Test Code LAB2425 Thyroid Disorder Screening Cascade

Notes:

If TSH is abnormal, T4 Free will be reflex ordered.  If T4 Free is low or normal, T3 Free will be reflex ordered.

Collection:

Specimen: Blood 

Preferred: Lt Green w/ Gel - Li Hep

Acceptable: SST or Red Top

Specimen Volume: 5 mL; Minimum 1.0 mL

 

Pediatric Collection:

One Lt Green w/ Gel - Li Hep, SST, or Red Top microtainer filled to 600 uL.

Stability:

If testing is delayed more than 24 hours, remove serum/plasma from the cells or gel separator.  Once serum/plasma is separated from cells:

 

Ambient: 8 Hours

Refrigerated (preferred): 1 Week

Frozen: 2 Weeks

Turn Around Time (TAT):

STAT: 2 HOURS

Routine: 4 HOURS

Test Availability:

24 hours a day / 7 days a week

Reference Interval:

TSH:

Age Female Male
< 2 months 1.12 - 5.50 mIU/L 1.12 - 6.31 mIU/L
2 months - < 1 year 1.12 - 4.47 mIU/L 0.96 - 4.90 mIU/L
1 year - < 2 years 1.00 - 4.37 mIU/L 0.93 - 4.79 mIU/L
2 years - < 5 years 0.85 - 4.07 mIU/L 0.83 - 4.37 mIU/L
5 years - < 10 years 0.89 - 4.07 mIU/L 0.81 - 4.07 mIU/L
   10 years - < 15 years       0.67 - 3.72 mIU/L       0.79 - 3.98 mIU/L   
15 years - < 20 years 0.47 - 3.63 mIU/L 0.55 - 3.55 mIU/L
>  20 years 0.35 - 4.94 mIU/L 0.35 - 4.94 mIU/L

 

 

T4 Free:

Age Female Male
< 2 months   0.69 - 1.85 ng/dL     0.78 - 1.83 ng/dL  
2 months - < 1 year 0.69 - 1.49 ng/dL 0.71 - 1.56 ng/dL
1 year - < 2 years 0.73 - 1.41 ng/dL 0.82 - 1.32 ng/dL
2 years - < 5 years 0.79 - 1.38 ng/dL 0.80 - 1.32 ng/dL
5 years - < 10 years 0.77 - 1.32 ng/dL 0.78 - 1.29 ng/dL
  10 years - < 15 years   0.66 - 1.22 ng/dL 0.69 - 1.23 ng/dL
15 years - < 19 years 0.67 - 1.22 ng/dL 0.67 - 1.22 ng/dL
> 19 years 0.70 - 1.48 ng/dL 0.70 - 1.48 ng/dL

 

T3 Free:

Age Female Male
< 4 days No reference range established No reference range established
4 days - < 1 year 2.3 - 4.9 pg/mL 2.3 - 4.9 pg/mL
1 year - < 12 years 2.8 - 4.4 pg/mL 2.8 - 4.4 pg/mL
12 years - < 15 years 2.5 - 4.0 pg/mL 2.9 - 4.3 pg/mL
15 years - < 19 years 2.3 - 3.7 pg/mL 2.3 - 3.9 pg/mL
< 19 years 1.7 - 3.7 pg/mL 1.7 - 3.7 pg/mL

 

 

Interpretive Data:

Reference ranges are adapted from Abbott method literature and validated in our lab. Results obtained with other methods cannot be used interchangeably.

Additional Test Codes

TSH W/RFLX

Performing Laboratory Section

Chemistry / UMC MAIN LABORATORY