> For the complete documentation index, see [llms.txt](https://help.sbtinstruments.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.sbtinstruments.com/mpd/cell-growth/carrying-capacity-k/overview-of-methods-for-k.md).

# Overview of methods for Κ

## Overview of typical methods

The table offers a concise overview of the main methods used to determine Κ. Use the links below to explore detailed information.

| Analytical method                                                                                                                                  | Advantages                                                                                                                                                                                       | Disadvantages                                                                                                                                                                                                                                                                                                |
| -------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| [BactoBox® for Κ](/mpd/cell-growth/carrying-capacity-k/overview-of-methods-for-k/bactobox-r-for-k.md)                                              | <ul><li>Fast and precise</li><li>Easy to standardize</li><li>Total cell concentration is constant after onset of stationary phase</li></ul>                                                      | <ul><li>Bacteria in clumps and chains may be underestimated</li><li>Not suitable when bacterial concentrations are substantially lower than non-bacterial particle concentrations.</li></ul>                                                                                                                 |
| [Fluorescence Flow Cytometry (FFC) for K](/mpd/cell-growth/carrying-capacity-k/overview-of-methods-for-k/fluorescence-flow-cytometry-ffc-for-k.md) | <ul><li>Fast and precise</li><li>Versatile</li><li>Total cell concentration is constant after onset of stationary phase</li></ul>                                                                | <ul><li>Staining requires optimization</li><li>FFC instruments are expensive</li><li>FFC requires skilled operators</li></ul>                                                                                                                                                                                |
| [Microscopy for K](/mpd/cell-growth/carrying-capacity-k/overview-of-methods-for-k/microscopy-for-k.md)                                             | <ul><li>Direct count technique (no proxy)</li><li>Possible to count individual cells in chains and clumps</li><li>Total cell concentration is constant after onset of stationary phase</li></ul> | <ul><li>Low throughput</li><li>Manual counting is slow and operator-dependent</li><li>Relatively low precision</li></ul>                                                                                                                                                                                     |
| Off-line optical methods [Optical methods for Κ](/mpd/cell-growth/carrying-capacity-k/overview-of-methods-for-k/optical-methods-for-k.md)          | <ul><li>Fast and simple</li><li>Inexpensive</li></ul>                                                                                                                                            | <ul><li>Calibration factors are required to convert arbitrary OD units to cell concentrations</li><li>Calibration factors shift as cell size changes in different media and growth phases</li><li>Does not distinguish between bacterial and non-bacterial objects</li></ul>                                 |
| On-line optical methods [Optical methods for Κ](/mpd/cell-growth/carrying-capacity-k/overview-of-methods-for-k/optical-methods-for-k.md)           | <ul><li>High throughput in 96-well plate readers</li><li>Frequent, automated measurements</li></ul>                                                                                              | <ul><li>OD saturates at higher concentrations</li><li>Calibration factors shift as cell size changes in different media and growth phases</li><li>96-well plates do not mimic flask and bioreactor conditions</li><li>Does not distinguish between bacterial and non-bacterial objects</li></ul>             |
| [Plate counts for Κ](/mpd/cell-growth/carrying-capacity-k/overview-of-methods-for-k/plate-counts-for-k.md)                                         | <ul><li>Gold standard for viable cell counts</li><li>Counts only cells. Non-bacterial background is excluded</li></ul>                                                                           | <ul><li>Low throughput</li><li>Slow (days)</li><li>CFU concentrations reach their peak in a relatively short time span</li><li>Relatively low precision</li></ul>                                                                                                                                            |
| [Dry cell weight for Κ](/mpd/cell-growth/carrying-capacity-k/overview-of-methods-for-k/dry-cell-weight-for-k.md)                                   | <ul><li>Quantitative and robust</li><li>Gold standard for biomass determination</li></ul>                                                                                                        | <ul><li>Low throughput</li><li>Slow (hours)</li><li>Calibration factors are required to convert weight to cell concentrations</li><li>Calibration factors shift as cell size changes in different media and growth phases</li><li>Does not distinguish between bacterial and non-bacterial objects</li></ul> |


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