Laboratory Technique Calculators

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Laboratory techniques are the standardized methods and procedures used to perform experiments and analyses in scientific research, clinical diagnostics, and industrial testing. In life sciences, core techniques span molecular biology (PCR, gel electrophoresis, sequencing), protein science (Western blot, ELISA, chromatography), cell biology (cell culture, flow cytometry, microscopy), and biochemistry (spectrophotometry, titration). Selecting the right technique for a given question and executing it correctly determines the reliability and reproducibility of scientific results.

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Core Molecular Biology Techniques

  • PCR: Amplifies specific DNA sequences from minimal template; primers define target; used in diagnostics, cloning, genotyping
  • Gel electrophoresis: Separates DNA/RNA/protein by size through agarose or polyacrylamide gel; visualized by ethidium bromide, SYBR Safe, or Coomassie
  • DNA sequencing: Sanger (single-read, high accuracy) or next-generation sequencing (massively parallel, whole-genome scale)
  • Restriction digestion: Restriction enzymes cut DNA at specific sequences; used for cloning and RFLP analysis

Protein Techniques

  • SDS-PAGE: Denaturing gel electrophoresis separating proteins by molecular weight
  • Western blot: SDS-PAGE + antibody detection; confirms protein identity and approximate size
  • ELISA: Antibody-based quantification of proteins in solution; highly sensitive (pg/mL)
  • Protein purification: Affinity, size-exclusion, ion-exchange chromatography

Cell Biology Techniques

  • Cell culture: Maintenance of mammalian or microbial cells in controlled conditions
  • Flow cytometry: Measures multiple physical and fluorescent properties of individual cells in suspension
  • Microscopy: Light, fluorescence, confocal, electron microscopy for cellular imaging
  • Immunohistochemistry (IHC): Antibody staining of tissue sections

Glossary

PCR (Polymerase Chain Reaction)
An amplification technique using thermocycling to exponentially copy a specific DNA sequence; foundational to molecular diagnostics, genotyping, cloning, and sequencing library preparation.
Western Blot
A technique combining SDS-PAGE size separation with antibody detection of specific proteins on a membrane; provides size confirmation; semi-quantitative; used to verify protein expression and identity.
Flow Cytometry
Measurement of multiple physical and fluorescent properties of individual cells in a liquid stream; enables immunophenotyping, cell cycle analysis, viability assessment, and cell sorting.

Frequently Asked Questions

Essential molecular biology techniques: PCR (amplifies specific DNA sequences — foundation of diagnostics, genotyping, cloning); gel electrophoresis (separates nucleic acids or proteins by size for analysis and purification); DNA sequencing (determines nucleotide sequence — Sanger for targeted regions, NGS for genomes); restriction enzyme digestion (cuts DNA at specific sites for cloning and analysis); Western blotting (detects specific proteins by antibody after size separation); and ELISA (quantifies proteins or antibodies in solution). These methods underpin virtually all of modern biology and medicine.

Western blot: proteins are separated by SDS-PAGE (by molecular weight), transferred to a membrane, blocked, then probed with primary and secondary antibodies; detects a protein of specific size in a complex mixture; provides size confirmation; semi-quantitative. ELISA: proteins in solution are captured and detected by antibodies in a plate format without size separation; fully quantitative (standard curve gives exact concentration); higher throughput; more sensitive (pg/mL). Use Western blot to confirm identity and check for degradation; use ELISA for quantification in many samples.

Flow cytometry passes cells single-file through a laser beam, measuring multiple parameters simultaneously: forward scatter (cell size); side scatter (cell complexity/granularity); and fluorescence from labeled antibodies or dyes in up to 30+ colors on modern instruments. Applications: cell population identification (immunophenotyping — CD4/CD8 T cells, B cells); cell cycle analysis (propidium iodide DNA staining); apoptosis detection (annexin V/PI); proliferation (CFSE dilution); intracellular protein detection (after fixation/permeabilization); and sorting viable cells for downstream experiments.

Technique selection depends on: (1) What you need to measure — DNA, RNA, protein, cell number, activity, binding. (2) Sensitivity required — single-molecule detection needs ddPCR or Simoa; bulk measurement can use spectrophotometry. (3) Throughput — 96-well ELISA for many samples vs. Western blot for a few. (4) Quantitative vs. qualitative — ELISA gives exact concentration; Western blot gives relative amounts. (5) Available equipment and expertise. (6) Sample type — blood, tissue, cells, supernatant. Always validate the technique with positive and negative controls and establish that the method's sensitivity, specificity, and range match your biological question.