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Table 2 Number of full blood count parameters at different stages of the quality check

From: Assessing data quality from the Clinical Practice Research Datalink: a methodological approach applied to the full blood count blood test

FBC parameter

1. In the CPRD Test dataset

2. After rectifying mismatches

3. After standardisation

4. After deriving values

Consistenta

Mismatcheda

Using entity codes

Using medical codes

RBC

17,496,396

2233

17,496,431

14,483,956

14,989,332

WBC

17,510,110

4

84,959

17,510,410

16,098,918

13,391,463

Haemoglobin

18,129,224

425

3318

18,136,578

13,241,660

15,956,530

Haematocrit

16,229,494

90

16,229,502

3,901,766

14,929,672

MCV

16,972,637

3

62

16,972,661

16,190,073

15,508,062

MCH

15,828,539

48

2443

15,828,610

14,776,728

14,978,026

MCHC

11,600,421

99

11,600,434

7,872,690

14,758,965

RDW

7,187,721

92,334

7,187,769

319,775

312,052

Platelets

17,321,447

2,267,404

798

17,321,470

16,110,377

15,409,813

MPV

2,299,660

2,049,996

2,041,360

1,964,340

Basophil count

15,064,082

1,647,073

625

15,064,119

13,939,287

11,532,656

Basophil %

1,670,876

1,579,167

1,498,690

11,577,466

Eosinophil count

15,963,917

1,579,993

6578

15,963,935

14,761,804

11,609,390

Eosinophil %

1,601,225

1,516,946

1,505,596

11,619,039

Lymphocyte

16,164,725

1,634,084

6825

16,164,762

14,950,124

12,202,708

Lymphocyte %

1,616,430

1,531,345

1,508,370

12,195,026

Monocyte count

16,047,916

1,601,135

7117

16,047,958

14,687,897

12,068,644

Monocyte %

1,625,740

1,537,874

1,510,233

12,076,052

Neutrophil count

16,235,819

1,586,187

9391

16,235,860

15,061,611

12,306,548

Neutrophil %

1,609,549

1,540,087

1,521,541

12,299,431

Not FBC

 

638,650

314,654

   

Total (% of 228,707,454)

217,752,448 (95.2%)

10,955,006 (4.8%)

10,955,006 (4.8%)

227,515,914 (99.5%)

185,982,456 (81.3%)

241,685,233 (105.7%)

  1. FBC full blood count, RBC red blood cell count, WBC white blood cell count, MCV mean corpuscular volume, MCH mean corpuscular haemoglobin, MCHC mean corpuscular haemoglobin concentration, RDW red blood cell distribution width, MPV mean platelet volume
  2. aConsistent records are those where the medical code and entity code correspond to the same parameter. Those where this does not apply were considered to have mismatched coding