Lab Abbreviations Guide

How to Use the Lab Abbreviations Guide

Searching for an Abbreviation or Term

Type any abbreviation (e.g. PCR, ELISA, His-tag) or any part of the full name (e.g. "polymerase", "immunoprecipitation") directly into the search box. The search is case-insensitive and works simultaneously across the abbreviation, the expanded name, and the description field — so searching "gel" will surface SDS-PAGE, agarose, and other gel-related terms. Results update instantly as you type; no button press is required.

Filtering by Scientific Category

Six category filters are available: All (default), DNA/RNA, Protein, Cell Biology, Microbiology, and Lab/Units. Click any filter button to restrict the displayed abbreviations to that domain. This is particularly useful when working in a specific area — for example, selecting "Protein" will immediately hide DNA and microbiology terms and show only protein biochemistry abbreviations such as SDS-PAGE, ELISA, IMAC, WB, and related entries.

Alphabetical Navigation

The A–Z button row below the filters lets you jump instantly to all abbreviations beginning with a specific letter. Greyed-out letters indicate no abbreviations starting with that letter are present in the current filtered view. Click All to return to the full unfiltered alphabetical listing. Combining a category filter with a letter jump is a fast way to find a specific entry — for example, filter to "Microbiology" then click "C" to quickly find CFU, CRISPR-related microbiology terms, and culture abbreviations.

Understanding Each Entry

Each abbreviation card shows three pieces of information: the abbreviation in bold monospace font, the full expanded name, and a description explaining what it means in a laboratory context. A colour-coded category badge (DNA/RNA, Protein, Cell Bio, Microbiology, or Lab/Units) appears on each card to indicate which scientific area the term belongs to.

Scientific Coverage of This Guide

The guide covers abbreviations from five major domains of biotechnology and molecular biology:

• DNA/RNA: Nucleotides, gene expression, sequencing, CRISPR, cloning vectors, PCR variants, epigenetics, and bioinformatics terms (PCR, CRISPR, sgRNA, ORF, Ct, ChIP, BLAST, lncRNA, and more)
• Protein: Protein purification, detection, mass spectrometry, antibody methods, and protein biochemistry (SDS-PAGE, ELISA, IMAC, His-tag, WB, SEC, MS, BCA, and more)
• Cell Biology: Cell imaging, cell culture, signalling, organelles, and fluorescent reporters (GFP, FACS, IHC, FRET, NLS, MTT, XTT, DMEM, and more)
• Microbiology: Bacterial culture, infection assays, growth media, and antimicrobial terms (CFU, MOI, OD600, LB, SOC, IPTG, X-gal, ABR, and more)
• Lab/Units: Common reagents, units, buffer components, centrifugation, and general laboratory tools (Da, kDa, RCF, rpm, BSA, DMSO, DTT, EDTA, OD, and more)

When to Use This Tool

This guide is most useful when reading a new protocol for the first time and encountering unfamiliar abbreviations, when writing a methods section and needing the correct full expansion of a term, when teaching or tutoring students in molecular biology courses, or when reviewing a research paper that uses abbreviations not defined in the text. Unlike a static PDF or textbook appendix, the search feature makes lookups instant even for partial or approximate terms.

Common Mistakes to Avoid with Lab Abbreviations

• Confusing RT-PCR with qRT-PCR: RT-PCR (reverse transcription PCR) is a qualitative or semi-quantitative two-step method; qRT-PCR adds real-time quantification and produces a Ct value. Using these terms interchangeably in a methods section is a frequent source of reviewer criticism.
• Mixing up rpm and RCF: Centrifuge protocols sometimes specify revolutions per minute (rpm) and sometimes relative centrifugal force (×g / RCF). These are not equivalent — the same rpm generates different RCF values depending on the rotor radius. Always verify which unit your protocol specifies before centrifuging samples.
• Assuming SDS-PAGE and Western blot are synonymous: SDS-PAGE is the gel separation step; a Western blot (WB) is the subsequent transfer, blocking, antibody incubation, and detection procedure. A Western blot requires SDS-PAGE, but SDS-PAGE alone (e.g. for Coomassie staining) is not a Western blot.

Interpreting Abbreviation Categories

Many laboratory techniques span multiple categories. For example, ChIP (chromatin immunoprecipitation) combines molecular biology (chromatin, DNA) with immunology (antibody precipitation) and is categorised here under DNA/RNA because it is primarily used to study gene regulation. Similarly, FACS (fluorescence-activated cell sorting) is categorised under Cell Biology even though it is also extensively used in microbiology and immunology. If you cannot find a term under one filter, try searching without a category filter applied.

Frequently Asked Questions

What does PCR stand for and how does it work?

PCR stands for Polymerase Chain Reaction, a method used to amplify a specific DNA segment through repeated cycles of thermal denaturation, primer annealing, and extension by a thermostable polymerase such as Taq or Phusion. Each cycle approximately doubles the number of target copies, enabling exponential amplification from as little as a single template molecule. A standard reaction requires a DNA template, two flanking primers, dNTPs, polymerase, and a buffer. PCR underpins cloning, genotyping, mutagenesis, and diagnostic testing and is one of the most widely used techniques in molecular biology.

What is the difference between mRNA, tRNA, and rRNA?

mRNA (messenger RNA) carries the protein-coding sequence transcribed from a gene and is translated by the ribosome into a polypeptide. tRNA (transfer RNA) is an adaptor molecule that recognises a specific codon via its anticodon loop and delivers the corresponding amino acid to the ribosome. rRNA (ribosomal RNA) forms the structural and catalytic core of the ribosome itself — in prokaryotes the major species are 16S and 23S, while in eukaryotes they are 18S, 28S, 5.8S, and 5S. Together these three RNA classes carry out translation, converting genetic information encoded in mRNA into functional protein sequences.

What does CRISPR stand for and what is it used for?

CRISPR stands for Clustered Regularly Interspaced Short Palindromic Repeats, sequences found in bacterial genomes that form part of a natural adaptive immune system against phage infection. In the laboratory, the CRISPR-Cas9 system uses a single guide RNA (sgRNA) to direct the Cas9 nuclease to a specific genomic location, where it introduces a targeted double-strand break. Repair via error-prone NHEJ creates gene knockouts, while homology-directed repair (HDR) enables precise sequence changes. CRISPR-Cas9 has largely replaced earlier genome editing approaches such as ZFNs and TALENs because of its ease of design and broad applicability.

What does SDS-PAGE stand for and what does it measure?

SDS-PAGE stands for Sodium Dodecyl Sulfate-Polyacrylamide Gel Electrophoresis, a technique that separates proteins by molecular weight under denaturing conditions. SDS denatures proteins and coats them with uniform negative charge proportional to mass, so migration through the polyacrylamide matrix depends solely on protein size — smaller proteins migrate faster. Molecular weight markers run alongside samples allow size estimation. SDS-PAGE is used routinely to check protein purity, verify recombinant expression, and prepare samples for downstream Western blotting.

What is the difference between qPCR and RT-qPCR?

qPCR (quantitative PCR or real-time PCR) monitors DNA amplification in real time using fluorescent dyes such as SYBR Green or sequence-specific TaqMan probes; the cycle threshold (Ct) value is inversely proportional to starting template amount. RT-qPCR (reverse transcription quantitative PCR) adds a prior step in which mRNA is converted to cDNA by a reverse transcriptase before qPCR amplification. RT-qPCR therefore measures gene expression (mRNA levels), while qPCR alone is used for DNA quantification, genotyping, or copy number analysis. Misusing these terms in a methods section is a common and avoidable error.

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