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CPT Code(s)



Spectrophotometry (SP)

Reference Range(s)

Male (U/L)Female (U/L)
<1 Month75-31648-406
1-11 Months82-383124-341
1-3 Years104-345108-317
4-6 Years93-30996-297
7-9 Years47-324184-415
10-12 Years91-476104-471
13-15 Years92-46841-244
16-19 Years48-23047-176
≥20 Years40-115
20-49 Years 33-115
≥50 Years 33-130

Clinical Significance

Serum alkaline phosphatase levels are of interest in the diagnosis of hepatobiliary disorders and bone disease associated with increased osteoblastic activity. Moderate elevations of alkaline phosphatase may be seen in several conditions that do not involve the liver or bone. Among these are Hodgkin's disease, congestive heart failure, ulcerative colitis, regional enteritis, and intra-abdominal bacterial infections. Elevations are also observed during the third trimester of pregnancy.

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