A state-of-the-science review and guide for measuring environmental exposure biomarkers in dried blood spots

Tyler A Jacobson, Jasdeep S Kler, Yeunook Bae, Jiexi Chen, Daniel T Ladror, Ramsunder Iyer, Denise A Nunes, Nathan D Montgomery, Joachim D Pleil, William E Funk, Tyler A Jacobson, Jasdeep S Kler, Yeunook Bae, Jiexi Chen, Daniel T Ladror, Ramsunder Iyer, Denise A Nunes, Nathan D Montgomery, Joachim D Pleil, William E Funk

Abstract

Background: Dried blood spot (DBS) sampling is a simple, cost-effective, and minimally invasive alternative to venipuncture for measuring exposure biomarkers in public health and epidemiological research. DBS sampling provides advantages in field-based studies conducted in low-resource settings and in studies involving infants and children. In addition, DBS samples are routinely collected from newborns after birth (i.e., newborn dried blood spots, NDBS), with many states in the United States permitting access to archived NDBS samples for research purposes.

Objectives: We review the state of the science for analyzing exposure biomarkers in DBS samples, both archived and newly collected, and provide guidance on sample collection, storage, and blood volume requirements associated with individual DBS assays. We discuss recent progress regarding analytical methods, analytical sensitivity, and specificity, sample volume requirements, contamination considerations, estimating extracted blood volumes, assessing stability and analyte recovery, and hematocrit effects.

Methods: A systematic search of PubMed (MEDLINE), Embase (Elsevier), and CINAHL (EBSCO) was conducted in March 2022. DBS method development and application studies were divided into three main chemical classes: environmental tobacco smoke, trace elements (including lead, mercury, cadmium, and arsenic), and industrial chemicals (including endocrine-disrupting chemicals and persistent organic pollutants). DBS method development and validation studies were scored on key quality-control and performance parameters by two members of the review team.

Results: Our search identified 47 published reports related to measuring environmental exposure biomarkers in human DBS samples. A total of 28 reports (37 total studies) were on methods development and validation and 19 reports were primarily the application of previously developed DBS assays. High-performing DBS methods have been developed, validated, and applied for detecting environmental exposures to tobacco smoke, trace elements, and several important endocrine-disrupting chemicals and persistent organic pollutants. Additional work is needed for measuring cadmium, arsenic, inorganic mercury, and bisphenol A in DBS and NDBS samples.

Significance: We present an inventory and critical review of available assays for measuring environmental exposure biomarkers in DBS and NDBS samples to help facilitate this sampling medium as an emerging tool for public health (e.g., screening programs, temporal biomonitoring) and environmental epidemiology (e.g., field-based studies).

Keywords: Biomarkers; Biomonitoring; Dried blood spots; Persistent organic pollutants; Trace elements; Environmental Tobacco Smoke.

Conflict of interest statement

The authors declare no competing interests.

© 2022. The Author(s).

Figures

Fig. 1. PRISMA flow diagram for identification…
Fig. 1. PRISMA flow diagram for identification of studies for final inclusion in the review.
PRISMA: Preferred Reporting Items for Systematic Reviews and Meta-Analyses.
Fig. 2. Exposure-disease continuum.
Fig. 2. Exposure-disease continuum.
This review focuses on environmental exposure biomarkers and excluded studies that used DBS sampling to measure biomarkers of response, for example, non-specific biomarkers of oxidative stress, inflammation, or cholinesterase depression, used commonly in hazard assessments.
Fig. 3. Graphical summary of collection card…
Fig. 3. Graphical summary of collection card with dried blood spots.
The image shows the size of each spot as a function of the volume of blood applied to the filter paper (50–70 µL). The range between 50 and 70 µL corresponds with the typical volume of a single drop of blood collected by finger- or heel-prick. The punches shown on the first three spots show the number of discs that can be removed based on commonly used disc sizes (i.e., 3.2-mm, ~3.2 µL whole blood; 4.7-mm, ~6.9 µL whole blood; and 6.0-mm, ~11.2 µL whole blood; see Supplementary information for more disc-blood volume estimates).

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