ALP ukat/L To IU/L Converter

Direct ALP Conversion

For alkaline phosphatase activity, 1 microkatal per litre equals 60 international units per litre. The same value is often written as 60 U/L. To convert ALP from ukat/L to IU/L, multiply by 60. To convert IU/L or U/L back to ukat/L, divide by 60. The factor comes from the definitions of the katal and the enzyme unit: a microkatal is one micromole per second, while one enzyme unit is one micromole per minute.

This converter is for unit display, copying values between reports, checking an overseas record, or converting a method sheet. It does not decide whether an ALP value is expected for a person. ALP can be reported with different reference intervals depending on laboratory method, age, pregnancy, bone growth, liver or bone context, and the rest of the test panel.

ALP Report Boundaries

ALP is an enzyme activity measurement, not a diagnosis. A laboratory report may list ALP with liver enzymes, bilirubin, gamma-GT, calcium, phosphate, vitamin D or bone markers. A clinician reads the result alongside age, clinical reason for testing, medicines, pregnancy status, symptoms and other results. This page deliberately avoids “low”, “high” or “normal” labels because those words need the laboratory’s own interval and clinical context.

If the result worries you, use the converted number only to communicate the unit clearly. Ask the requesting clinician, GP, pharmacist or laboratory if the report unit or reference interval is unclear. For urgent symptoms, use the appropriate urgent-care route rather than a unit converter.

Worked Examples

Example 1: An ALP result is 1.5 ukat/L. Multiply by 60. The converted result is 90 IU/L or 90 U/L. A reverse check is 90 divided by 60, which returns 1.5 ukat/L.

Example 2: An older report shows ALP as 120 U/L. Divide 120 by 60. The converted result is 2.0 ukat/L. If a laboratory reference interval is printed in U/L, convert the range as well before comparing units.

Example 3: A method sheet lists a reference interval of 0.6 to 2.1 ukat/L. The matching display in IU/L is 36 to 126 IU/L. This is only a unit change; it does not make the interval transferable to another laboratory.

Quick ALP Conversion Table

Common Unit Mistakes

• Multiplying IU/L by 60 instead of dividing by 60 when converting to ukat/L.
• Treating U/L, IU/L and ukat/L as if they were interchangeable labels.
• Converting the result but leaving the reference interval in the old unit.
• Using an adult interval for a child or pregnancy report without checking the lab note.
• Comparing ALP values from different methods without clinical advice.

When To Ask For Help

Ask the laboratory or clinical team if the report uses an unfamiliar unit, if ALP appears with several other abnormal flags, if the reference interval is missing, or if a form asks for a value in a unit you do not recognise. Unit conversion can make the number readable, but it cannot say why the test was ordered or what should happen next.