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Consolidated Comparison of Hematology Performance Specifications

 It's 2018, do you know how good your hematology performance needs to be? Just as with chemistry and immunoassay, there's no general consensus, agreement or standardization. But here's a consolidated summary that reveals how large the discrepancies are.

 Consolidated Comparison of Hematology Performance Specifications

January 22, 2018

March 9th, 2018 Updated with corrections to IQMH specifications and further notices on the use of their specifications

May 11, 2018 Updated with new performance specifications derived from Coskun 2018**

Hematology Analyte

Sample

Type

 Total Allowable Error GoalTEa%

TEa Source

Recommended Critical Decision Level

HGB

B

±7%

CLIA,WLSH,NYS,AAB,CAP

1, 45g/L
2, 105g/L
3, 230g/L

±6%

ESFEQA, Rilibak

±5%

MIN SPANISH EQA

±4 g/L < 100g/L
±5% > 100 g/L

IQMH*

± 5 < 100
± 5% > 100
RCPA 2010

±4.19%

BV DES

±3.87% EFLM 2018**

HCT

B

±6%

CLIA,WLSH,NYS,AAB,CAP

1, 14%
2, 33%
3, 70%

±12%

ESFEQA

±0.02 L/L < 0.20 L/L
±7% >0.20 L/L

IQMH*

±8%

MIN SPANISH EQA

±9.0%

Rilibak

± 0.04 < 20
± 20% > 0.2
RCPA 2010

±3.97%

BV Des

±3.86% EFLM 2018**

MCH

B

±2.5%

BV DES

1, 27pg
2, 34pg

±5.0%

MIN SPANISH EQA

±9%

ESFEQA

MCHC

B

±2.2%

BV

1, 320g/L
2, 360g/L

±7%

ESFEQA

±1.27% EFLM 2018**

MCV

 

±2.42%

BV DES

1, 80fL
2, 100fL

±7%

MIN SPANISH EQA

±10%

ESFEQA

± 5 < 50
± 10% > 50
RCPA 2010

±5 fL <50 fL
±5% >50 fL

IQMH*

 
±1.60% EFLM 2018**  

PLT

B

±25%

CLIA,WLSH,NYS,AAB,CAP

1, 10*10^9/L
2, 50*10^9/L
3, 100*10^9/L
4, 600*10^9/L
5, 1000*10^9/L

±13.4%

BV

±15%

ESFEQA

± 25 < 100
± 25% > 100
 RCPA 2010

±10 x 109/L  <20 x 109/L
±15% >20 x 109/L

IQMH*

±8.51% EFLM 2018**

RBC

B

±6%

CLIA,WLSH,NYS,AAB,CAP

1, 3.5*10^12/L
2, 5.5*10^12/L

±4%

MIN SPANISH EQA

±4.4%

BV DES

±0.3*1012/L ≤4*1012/L
±8% >4*1012/L

ESFEQA

± 0.2 < 2.0
± 10% > 2.0
RCPA 2010

±0.2 x 1012/L <2.0 x 1012/L
±10% > 2.0 x 1012/L

IQMH*

±8.0%

Rilibak

±3.84% EFLM 2018**

WBC

B

±15%

CLIA,AAB,CAP

1, 0.5*10^9/L
2, 3*10^9/L
3, 12*10^9/L
4, 30*10^9/L

±9%

MIN SPANISH EQA

±17.6%

BV Des

±0.7*109/L ≤4*109/L
±18% >4*109/L

ESFEQA

±0.5 x 109/L <5.0 x 109/L
±10% < 5.0 x 109/L

IQMH*

± 0.5 < 5.0
± 10% > 5.0
RCPA 2010

±18.0%

Rilibak

±11.5% EFLM 2018**

RDW

B

±1%

ESFEQA

1, 15%

MPV

B

±13%

ESFEQA

1, 8fL
2, 12.5fL

±12%

IQMH*

±5.84%

BV Des

±3.39% EFLM 2018**

Antithrombin III

P

8.30%

BV

1, 50%
2, 75%

±8%* ≤50%  (* % is unit)
±16%*
50%  (* % means ratio)

ESFEQA

±16mg/L ≤100mg/L
±16% >100mg/L

ESFEQA

APTT

P

4.50%

BV

1, 40s
2, 90s

15%

CLIA,WLSH,NYS,AAB,CAP

± 10 < 40
± 25% > 40
RCPA 2010

18%

ESFEQA

D-Dimer

P

30%

AAB

1, 1mg/L

±0.13mg/L ≤1mg/L
±31% >1mg/L

ESFEQA

± 0.25 < 0.50
± 50% > 0.50
RCPA 2010

±0.13 FEU mg/L 1 FEU mg/L
±31% 1 FEU mg/L

ESFEQA

Fibrinogen

P

13.60%

BV DES

1, 0.3g/L
2, 1.0g/L
3, 5.0g/L

20%

CLIA,WLSH,NYS,AAB,CAP

±0.34g/L ≤ 2g/L
±17% >2g/L

ESFEQA

±24%

MIN SPANISH EQA

Prothrombin Time

P

5.30%

BV DES

1, 15s
2, 30s

15%

CLIA,WLSH,NYS,AAB,CAP

±12% ≤50%
±23% >50%

ESFEQA

±12 ≤0.5
±23% >0.5

ESFEQA

±2.3s ≤10s
±23% >10s

ESFEQA

Granuloctye count

 

±0.5 x 109/L < 4.0 x 109/L
±15% > 4.0 x 109/L

IQMH*

 
± 1.0 < 10.0
± 10% > 10.0
RCPA 2010

Lymphocyte count

 

±0.5 x 109/L < 4.0 x 109/L
±15% > 4.0 x 109/L

IQMH*

 
± 2.0 < 10.0
± 20% > 10.0
RCPA 2010

±17.6%

BV DES

±13.74% EFLM 2018**

Monocyte count

 

±0.5 x 109/L < 4.0 x 109/L
±15% > 4.0 x 109/L

IQMH*

 
± 3.0 < 10.0
± 30% > 10.0
RCPA 2010

±27.9%

BV DES

±14.21% EFLM 2018**

Neutrophil count

 

±23.35%

BV DES

 
± 1.0 < 10.0
± 10% > 10.0
RCPA 2010
±14.65% EFLM 2018**

Eosinophil count

 

±0.5 x 109/L < 4.0 x 109/L
±15% > 4.0 x 109/L

IQMH*

 
± 3.0 < 10.0
± 30% > 10.0
RCPA 2010

±37.1%

BV DES

±26.15% EFLM 2018**

Basophil count

 

±0.5 x 109/L < 4.0 x 109/L
±15% > 4.0 x 109/L

IQMH*

 
± 3.0 < 10.0
± 30% > 10.0
RCPA 2010

±38.5%

BV DES

±15.58% EFLM 2018**

(automated)
Reticulocyte count

 

±33% (instrument group mean)

IQMH*

 

±35% (%)

MIN SPANISH EQA

±16.5%

BV DES

 

±14.38% EFLM 2018**

CLIA represents the US CLIA regulations

WLSH is Wisconsin State Lab of Hygiene.

NYS represents the now defunct New York State PT requirements

AAB is the PT program of the American Association of Bioanalyts

CAP is the PT program of the College of American Pathologists

Rilibak are the German EQA performance specifications of the Rilibak rules. Note these are the interlaboratory comparison figures. The Rilibak do state within-laboratory specifications that are smaller but these are supposed to be used for RMSD calculations, which is an alternative approach than allowable total error.

Min Spanish EQA are the minimum consensus performance specifications of multiple Spanish EQA surveys

*IQMH is the PT program of the Institute for Quality Management in Healthcare. www.IQMH.org These data are used here with permission. 2018. Copyright Institute for Quality Management in Healthcare (IQMH). All rights reserved. No part of the material protected by this copyright may be reproduced without written permission from IQMH. Please contact This email address is being protected from spambots. You need JavaScript enabled to view it. for the most current data pertaining to IQMH allowable performance limits, as IQMH is not bound to inform Westgard Web of any updates.

BV DES represents the desirable performance specifications of the Biologic Variation Database

ESfEQA is the European Society for External Quality Assessment

RCPA 2010 is the allowable limits of performance for the RCAP QAP in Haematology from 2010

**EFLM 2018: Within-subject and between-subject biological variation estimates of 21 hematological parameters in 30 healthy subjects. Clin Chem Lab Med. 2018 Apr 2. pii: /j/cclm.ahead-of-print/cclm-2017-1155/cclm-2017-1155.xml. doi: 10.1515/cclm-2017-1155. Coşkun A, Carobene A, Kilercik M, Serteser M, Sandberg S, Aarsand AK, Fernandez-Calle P, Jonker N, Bartlett WA, Díaz-Garzón J, Huet S, Kızıltaş C, Dalgakıran I, Ugur E, Unsal I; European Biological Variation Study of the EFLM Working Group on Biological Variation. Note that this paper only calculated desirable imprecision and desirable bias, but desirable total allowable error has been calculated from the data.

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