Steroid Detection in Small Volume Blood by LC-MS/MS

Importance of the topic

Liquid chromatography–tandem mass spectrometry (LC-MS/MS) provides high specificity and sensitivity for simultaneous detection of multiple steroid hormones in small blood volumes. This technique addresses limitations of immunoassays, offering enhanced selectivity and reduced sample requirements—critical for clinical research and point-of-care testing.

Study objectives and overview

This proof-of-concept study aimed to establish and validate an LC-MS/MS method on the Shimadzu 8060 triple quadrupole platform to quantify 16 steroid hormones in 200 μL plasma from fingerstick and venous blood. Primary goals included (i) demonstrating method linearity, accuracy, and precision following CLIA requirements, and (ii) comparing steroid concentrations between capillary and venous samples from 40 individuals.

Methodology

Sample preparation:

• Spiking of 16 steroids into charcoal-stripped FBS to create calibrators and controls
• SPE on conditioned 96-well plates: MeOH and water conditioning, sample loading, washing, elution with MeOH
• Evaporation under nitrogen, reconstitution in water/MeOH, vortex mixing, dilution, and autosampler injection

Chromatographic separation:

• Nexera HPLC with Restek Raptor Biphenyl column (100 × 2.1 mm, 1.8 μm)
• Binary gradient starting at 60% organic modifier, 0.4 mL/min flow, 6 min total runtime, 35 °C column temperature
• Ammonium fluoride as mobile phase modifier

Mass spectrometry:

• Shimadzu 8060 triple quadrupole with ESI source (4 kV)
• Polarity switching for positive and negative ions
• LabSolutions Connect for gas flow and temperature optimization
• MRM Optimization Wizard for collision energy tuning

Used instrumentation

• Shimadzu Nexera HPLC system
• Restek Raptor Biphenyl column
• Shimadzu LCMS-8060 triple quadrupole mass spectrometer
• LabSolutions Connect and MRM Optimization Wizard software

Main results and discussion

The method met CLIA validation criteria with LOQs comparable to immunoassays. Key performance metrics:

• Linearity ranges covering physiological reference levels for 16 steroids
• Limit of quantitation from 0.125 μg/dL (cortisone) to 25 ng/dL (corticosterone)
• Precision CV <15% at LOQ; accuracy >90%
• Matrix effects between 80% and 118%; recoveries 73–88%
• Significant correlation (R2 > 0.98) between fingerstick and venous samples

Baseline separation of isobaric pairs was confirmed by MS chromatograms.

Benefits and practical applications

• Minimal blood volume requirement enables fingerstick sampling
• High specificity reduces cross-reactivity seen in immunoassays
• Rapid 6 min runtime enhances throughput in clinical labs
• Cost and safety advantages of capillary sampling for remote or point-of-care settings

Future trends and applications

Further developments may include integration with microfluidic devices for true point-of-care LC-MS/MS, wider steroid panels, and adoption of high-resolution mass spectrometry for enhanced specificity. Automated sample preparation and data analysis pipelines will streamline large-scale clinical studies and longitudinal monitoring.

Conclusion

This LC-MS/MS assay on the Shimadzu 8060 platform delivers sensitive, accurate quantitation of 16 steroids from small-volume blood samples. Strong agreement between capillary and venous measurements positions fingerstick collection as a viable alternative to immunoassays, offering flexibility and efficiency in clinical hormone testing.

References

• Shimadzu Scientific Instruments. SSI-LCMS-097: Steroid Detection in Small Volume Blood by LC-MS/MS; First Edition: March 2018.