Test master · Potassium (K⁺)
Code CH-K · Chemistry · LOINC 2823-3 · last changed 02 Oct 2026 by Dr. Kamran Javed (v7)
mL
to
Haemolysis rule: if H-index ≥ 2+, K⁺ is not reported — sample marked for recollection with comment “Haemolysed sample — potassium falsely elevated”.
| Sex | Age from | Age to | Condition | Low | High | Source |
|---|---|---|---|---|---|---|
| Any | 0 d | 30 d | Neonate | 3.7 | 5.9 | Tietz |
| Any | 31 d | 1 y | Infant | 4.1 | 5.3 | Tietz |
| Any | 1 y | 18 y | Child | 3.4 | 4.7 | Tietz |
| Any | 18 y | — | Adult | 3.5 | 5.1 | Verified locally (n=20) |
| F | 18 y | 45 y | Pregnancy · any trimester | 3.3 | 5.1 | Verified |
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Delta check
IF previous K⁺ within 72 h AND |current − previous| > 1.0 mmol/L THEN hold for review · flag “Delta fail — check identity / haemolysis”
Calculated test (example: LDL-C Friedewald)
LDL = TC − HDL − (TG ÷ 5) // mg/dL
ONLY IF TG < 400 mg/dL ELSE report “Not calculated — TG > 400; direct LDL advised”
// recalculates automatically when TC, HDL or TG is edited
ONLY IF TG < 400 mg/dL ELSE report “Not calculated — TG > 400; direct LDL advised”
// recalculates automatically when TC, HDL or TG is edited
Reflex rules
IF TSH > 4.5 mIU/L OR < 0.4 THEN ADD FT4 · billable: yes (Rs 1,400) · notify doctor
IF HBsAg = Reactive THEN ADD HBsAg confirmatory (neutralisation) · billable: no
IF Urine culture = Growth ≥10⁵ THEN ADD AST panel · billable: included
+ Add rule
IF HBsAg = Reactive THEN ADD HBsAg confirmatory (neutralisation) · billable: no
IF Urine culture = Growth ≥10⁵ THEN ADD AST panel · billable: included
Chemistry autoverification · rule set v3.2
CLSI AUTO10/AUTO15 · validated 22 Sep 2026 by Dr. Kamran Javed · next validation Sep 2027
QC for the run is accepted (no Westgard reject)required
No analyzer error or suspect flagsrequired
Serum indices: H < 1+, L < 2+, I < 2+required
Result within measuring range (1.0–10.0)required
Result within autoverify range 3.0 – 5.8 mmol/Lrequired
Delta check passesrequired
Not a critical valuerequired
Consistency: Na/K/Cl anion gap 8–20advisory
Every autoverified result is stamped with the rule-set version and time. Any change creates a new version that must be re-validated before use.
| Analyzer | Protocol | Instrument code | MedX code | Mode | Factor |
|---|---|---|---|---|---|
| Mindray BS-480 · Gulberg | ASTM LIS2-A2 / TCP | K | CH-K | Host query | 1.0 |
| Mindray BS-240 · DHA 5 | HL7 v2.3.1 ORU | POT | CH-K | Batch download | 1.0 |
| Manual ISE bench | — | — | CH-K | Manual entry | — |
| Price list | Applies to | Price (Rs) | Rule |
|---|---|---|---|
| MRP (walk-in) | All branches & centres | 650 | — |
| B2B · Noor Surgical Hospital | Client portal orders | 455 | 30% off MRP |
| B2B · Al-Shifa Diagnostics Okara | Referral lab | 400 | Fixed |
| Panel · Engro Fertilizers | Employees & dependants | 520 | 20% off · co-pay 0% |
| Franchise transfer price | Faisalabad, Sheikhupura | 390 | Centre keeps MRP − transfer |