Illumina UD Indexes
The following tables depict plate layouts and pooling strategies for Illumina UD Indexes, which are designed for dual indexing.
Pooling strategies differ based on the type of chemistry used. Refer to [XLEAP-SBS Chemistry] Two-Plex Through Eight-Plex Pooling Strategies for instruments using XLEAP-SBS chemistry.
These indexes include Illumina DNA/RNA UD Indexes, Tagmentation and Illumina RNA UD Indexes, Ligation.

1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
|
---|---|---|---|---|---|---|---|---|---|---|---|---|
A |
UDP0001 |
UDP0009 |
UDP0017 |
UDP0025 |
UDP0033 |
UDP0041 |
UDP0049 |
UDP0057 |
UDP0065 |
UDP0073V3 |
UDP0081 |
UDP0089 |
B |
UDP0002 |
UDP0010 |
UDP0018 |
UDP0026 |
UDP0034 |
UDP0042 |
UDP0050 |
UDP0058 |
UDP0066 |
UDP0074V3 |
UDP0082 |
UDP0090 |
C |
UDP0003V3 |
UDP0011 |
UDP0019 |
UDP0027 |
UDP0035 |
UDP0043 |
UDP0051 |
UDP0059 |
UDP0067 |
UDP0075V3 |
UDP0083 |
UDP0091 |
D |
UDP0004 |
UDP0012 |
UDP0020 |
UDP0028 |
UDP0036 |
UDP0044 |
UDP0052 |
UDP0060 |
UDP0068 |
UDP0076V3 |
UDP0084V3 |
UDP0092 |
E |
UDP0005V3 |
UDP0013 |
UDP0021 |
UDP0029 |
UDP0037 |
UDP0045 |
UDP0053V3 |
UDP0061 |
UDP0069V3 |
UDP0077 |
UDP0085 |
UDP0093 |
F |
UDP0006 |
UDP0014 |
UDP0022 |
UDP0030 |
UDP0038 |
UDP0046V3 |
UDP0054V3 |
UDP0062 |
UDP0070V3 |
UDP0078 |
UDP0086 |
UDP0094 |
G |
UDP0007 |
UDP0015 |
UDP0023 |
UDP0031 |
UDP0039 |
UDP0047 |
UDP0055V3 |
UDP0063 |
UDP0071V3 |
UDP0079 |
UDP0087 |
UDP0095 |
H |
UDP0008 |
UDP0016 |
UDP0024 |
UDP0032 |
UDP0040 |
UDP0048 |
UDP0056V3 |
UDP0064 |
UDP0072V3 |
UDP0080 |
UDP0088 |
UDP0096 |

1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
|
---|---|---|---|---|---|---|---|---|---|---|---|---|
A |
UDP0097 |
UDP0105 |
UDP0113 |
UDP0121 |
UDP0129 |
UDP0137 |
UDP0145V3 |
UDP0153 |
UDP0161 |
UDP0169 |
UDP0177 |
UDP0185 |
B |
UDP0098 |
UDP0106 |
UDP0114 |
UDP0122 |
UDP0130 |
UDP0138 |
UDP0146V3 |
UDP0154 |
UDP0162 |
UDP0170 |
UDP0178 |
UDP0186 |
C |
UDP0099 |
UDP0107 |
UDP0115 |
UDP0123 |
UDP0131 |
UDP0139 |
UDP0147V3 |
UDP0155V3 |
UDP0163 |
UDP0171 |
UDP0179V3 |
UDP0187 |
D |
UDP0100 |
UDP0108 |
UDP0116 |
UDP0124 |
UDP0132 |
UDP0140 |
UDP0148V3 |
UDP0156 |
UDP0164 |
UDP0172 |
UDP0180 |
UDP0188 |
E |
UDP0101 |
UDP0109 |
UDP0117 |
UDP0125 |
UDP0133 |
UDP0141 |
UDP0149 |
UDP0157 |
UDP0165 |
UDP0173 |
UDP0181 |
UDP0189 |
F |
UDP0102V3 |
UDP0110 |
UDP0118 |
UDP0126 |
UDP0134 |
UDP0142 |
UDP0150 |
UDP0158 |
UDP0166 |
UDP0174 |
UDP0182 |
UDP0190 |
G |
UDP0103 |
UDP0111 |
UDP0119 |
UDP0127 |
UDP0135 |
UDP0143 |
UDP0151 |
UDP0159 |
UDP0167 |
UDP0175 |
UDP0183 |
UDP0191 |
H |
UDP0104 |
UDP0112 |
UDP0120 |
UDP0128 |
UDP0136 |
UDP0144 |
UDP0152 |
UDP0160 |
UDP0168 |
UDP0176 |
UDP0184 |
UDP0192 |

1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
|
---|---|---|---|---|---|---|---|---|---|---|---|---|
A |
UDP0193V3 |
UDP0201 |
UDP0209 |
UDP0217 |
UDP0225 |
UDP0233 |
UDP0241 |
UDP0249 |
UDP0257 |
UDP0265V3 |
UDP0273 |
UDP0281 |
B |
UDP0194V3 |
UDP0202 |
UDP0210 |
UDP0218V3 |
UDP0226 |
UDP0234 |
UDP0242V3 |
UDP0250 |
UDP0258V2 |
UDP0266V3 |
UDP0274 |
UDP0282 |
C |
UDP0195V3 |
UDP0203 |
UDP0211 |
UDP0219 |
UDP0227V3 |
UDP0235 |
UDP0243 |
UDP0251 |
UDP0259 |
UDP0267V3 |
UDP0275 |
UDP0283 |
D |
UDP0196V3 |
UDP0204 |
UDP0212 |
UDP0220 |
UDP0228 |
UDP0236 |
UDP0244V3 |
UDP0252V2 |
UDP0260 |
UDP0268V3 |
UDP0276 |
UDP0284 |
E |
UDP0197 |
UDP0205 |
UDP0213 |
UDP0221V3 |
UDP0229 |
UDP0237 |
UDP0245 |
UDP0253 |
UDP0261 |
UDP0269 |
UDP0277 |
UDP0285V3 |
F |
UDP0198 |
UDP0206 |
UDP0214 |
UDP0222V3 |
UDP0230 |
UDP0238 |
UDP0246 |
UDP0254 |
UDP0262 |
UDP0270 |
UDP0278 |
UDP0286V3 |
G |
UDP0199 |
UDP0207 |
UDP0215 |
UDP0223V3 |
UDP0231 |
UDP0239 |
UDP0247 |
UDP0255 |
UDP0263 |
UDP0271 |
UDP0279 |
UDP0287V3 |
H |
UDP0200 |
UDP0208 |
UDP0216 |
UDP0224V3 |
UDP0232 |
UDP0240 |
UDP0248 |
UDP0256V3 |
UDP0264 |
UDP0272 |
UDP0280 |
UDP0288V3 |

1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
|
---|---|---|---|---|---|---|---|---|---|---|---|---|
A |
UDP0289V2 |
UDP0297 |
UDP0305 |
UDP0313 |
UDP0321V3 |
UDP0329 |
UDP0337 |
UDP0345 |
UDP0353 |
UDP0361 |
UDP0369V3 |
UDP0377 |
B |
UDP0290V2 |
UDP0298V3 |
UDP0306 |
UDP0314 |
UDP0322 |
UDP0330 |
UDP0338 |
UDP0346 |
UDP0354 |
UDP0362 |
UDP0370V3 |
UDP0378 |
C |
UDP0291V2 |
UDP0299 |
UDP0307 |
UDP0315 |
UDP0323 |
UDP0331 |
UDP0339 |
UDP0347 |
UDP0355 |
UDP0363 |
UDP0371V3 |
UDP0379 |
D |
UDP0292 |
UDP0300 |
UDP0308 |
UDP0316 |
UDP0324 |
UDP0332 |
UDP0340 |
UDP0348 |
UDP0356 |
UDP0364 |
UDP0372V3 |
UDP0380 |
E |
UDP0293 |
UDP0301V2 |
UDP0309 |
UDP0317 |
UDP0325 |
UDP0333 |
UDP0341 |
UDP0349 |
UDP0357 |
UDP0365 |
UDP0373 |
UDP0381 |
F |
UDP0294 |
UDP0302 |
UDP0310 |
UDP0318 |
UDP0326 |
UDP0334 |
UDP0342 |
UDP0350 |
UDP0358 |
UDP0366 |
UDP0374 |
UDP0382 |
G |
UDP0295 |
UDP0303 |
UDP0311 |
UDP0319 |
UDP0327 |
UDP0335 |
UDP0343 |
UDP0351 |
UDP0359 |
UDP0367 |
UDP0375 |
UDP0383 |
H |
UDP0296 |
UDP0304 |
UDP0312 |
UDP0320 |
UDP0328 |
UDP0336 |
UDP0344 |
UDP0352 |
UDP0360 |
UDP0368 |
UDP0376 |
UDP0384 |

Two-plex through eight-plex pooling strategies are only recommended for Illumina UD Indexes Set A and Set B. Illumina UD Indexes Set C and Set D are not designed for low-plexity pooling.
The following table shows index adapters (wells) that can be combined in a two-plex through eight-plex pool, while the color-coded figure illustrates each combination.
Pool any plexity ≥ 2 from the top or bottom of a column. Do not pool across a row.
Plexity |
Combinations Set A and Set B |
Combinations Set C and Set D |
Color in Figure |
||||||
---|---|---|---|---|---|---|---|---|---|
2 |
The first two or last two wells in a column:
Rows C–F are not used. |
Not Recommended |
Orange |
||||||
3 |
The first three or last three wells in a column:
Rows D and E are not used. |
Not Recommended |
Gray |
||||||
4 |
The first four or last four wells in a column:
|
Not Recommended |
Purple |
||||||
5 |
The first five or last five wells in a column:
|
Not Recommended |
Blue |
||||||
6 |
[Option 1] The first six or last six wells in a column:
[Option 2] The first two wells (A and B) or last two wells (G and H) in one column, and any four wells in an adjacent column. |
Not Recommended |
Green |
||||||
7 |
The first seven or last seven wells in a column:
|
Not Recommended |
Pink |
||||||
8 |
The entire column. |
Not Recommended |
Teal |

This section applies to any instruments using XLEAP-SBS Chemistry.
Two-plex through eight-plex pooling strategies are only recommended for Illumina UD Indexes Set A and Set B. Illumina UD Indexes Set C and Set D are not designed for low-plexity pooling.
The following table shows index adapters (wells) that can be combined in a two-plex or three-plex pool.
Plexity |
Combinations Set A |
Combinations Set B |
Combinations Set C and Set D |
|||||||||||||||||||||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2 |
|
|
Not Recommended |
|||||||||||||||||||||||||||||||||||||||||||||||||||
3 |
|
|
Not Recommended |
The following figures display four-plex through eight-plex index pooling recommendations by column for Plates A and B. Numbers represent plate columns, and letters represent the rows to be paired within each column. For example, Plate A, column 2, rows ABCD represent indexes UDP0009, UDP0010, UDP0011, and UDP0012.
The orange wells in the following color-coded figures are not recommended for use.
Illumina UD Plate A Indexes
Illumina UD Plate B Indexes

Nine-plex pooling strategies are only recommended for Illumina UD Indexes Set A and Set B. Illumina UD Indexes Set C and Set D are not designed for low-plexity pooling.
Use index adapters from any wells that optimize color balance in a sequencing run, for example:
• | A1–H1 and A2 |
• | A4–D4 and A5–E5 |
• | A7–F7 and A8–C8 |
• | A10–C10, A11–C11, and A12–C12 |
The following figure depicts all four examples.