Preop Hemoglobin

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Preop Hemoglobin

Description

Most recent preoperative hemoglobin within 365 days

References:

1.Frank H. Wians, Jr., PhD; Merck Manuel, professional version; Blood Tests: Normal Values; accessed 10-17-2016; http://www.merckmanuals.com/professional/appendixes/normal-laboratory-values/blood-tests-normal-values#v8508814

2. Farmacotherapeutisch kompass, 2016, the Netherlands; published 10-01-2016; accessed 10-17-2016; https://www.farmacotherapeutischkompas.nl/bladeren-volgens-boek/inleidingen/inl-referentiewaarden-klinische-chemie

3. FDA, investigations operations manual 2015, appendix C, Blood Serum Chesitry – Normal Values ; published 2015, accessed 10-17-2016; http://www.fda.gov/downloads/ICECI/Inspections/IOM/UCM135835.pdf

4. Chojnowski K, Janus A, Blizniewska K, Robak M1, Trelinski J.; Long-lasting extreme anemia during the therapy of acute lymphoblastic leukemia in a Jehovah's Witness patient; Transfusion. 2016 Oct;56(10):2438-2442. doi: 10.1111/trf.13703. Epub 2016 Jul 7.

5. Kariya T, Ito N, Kitamura T, et al. Recovery from extreme hemodilution (hemoglobin level of 0.6 g/dL) in cadaveric liver transplantation. A Case Rep 2015;4:132-6.

6. Braun SL, Eicken A, Kaemmerer H.; Iron deficiency in a patient with extreme erythrocytosis due to cyanotic congenital heart disease.Int J Cardiol. 2007 Mar 20;116(2):e74-5. Epub 2006 Nov 9.

7. Erasmus Medical Center Rotterdam; Diagnostiek, Conversiefactoren; published March 2010; accessed 10-17-2016; http://www.erasmusmc.nl/akc/Diagnostiek/Diagnostiek/4012531/?view=active

Limitation

This collation does not set “normal” ranges for the values. Valid ranges account only for data collection extremes. There is a conversion for this collation for sites that use alternate units.

Data quality is limited to individual site documentation accuracy, completeness, and variable mapping, which is performed by each site, independently. MPOG, as the coordinating center, reviews data quality at each data upload and monthly via Data Diagnostics and Case Validation tools. This review, while thorough, may not contain all data elements relevant to this phenotype and thus should be carefully reviewed by the user.

Value Type

Enumeration

Value	Value Code	Definition

Return Columns

Name	Data Type

Granularity

Logic

Values collected under the following MPOG Concepts

ID	Concept Name
5080	Formal lab - Blood gas - Hemoglobin (g/dL)
3504	Formal lab - Blood gas - Hemoglobin (g/L)
5005	Formal lab - Hemoglobin (g/dL)
3502	Formal lab - Hemoglobin (g/L)
5081	POC - Blood gas - Hemoglobin (g/dL)
3505	POC - Blood gas - Hemoglobin (g/L)
3440	POC - Coulter counter - Hemoglobin (g/dL)
3510	POC - Coulter counter - Hemoglobin (g/L)

Convert g/L with the below equation

g/L x 0.1 = g/dl

All values expressed in g/dl

Obtain most recent (latest) valid hemoglobin using the Hemoglobin Concepts listed in the table above. Look prior to anesthesia start and within 365 days of anesthesia start with number of days prior to surgery

Valid >0 g/dl and <30 g/dl
If data invalid: Output = -998
If data valid: Output = (numeric value g/dl)
If multiple hemoglobins are listed at the same time, take the lowest.

General reference ranges

12-18 g/dl (Conventional Unit, whereas SI unit = g/l)1,2,3
7.5-11 mmol/l 1,2,3
Extreme values: 0.6 g/dl4,5 and 25.76

Conversion to g/dl before classifying as valid or invalid 7

amount in mmol/l / 0.6206 =amount in mg/dl 7